Flushing system for sanitary flushing devices

ABSTRACT

A flushing system for sanitary flushing devices, especially for flushing and disinfecting bed pans, urine bottles and the like, with pressure flushers for cold and warm water, in which two pressure flushers for cold and warm water respectively are connected to a common flushing conduit in which a pipe interruptor and an injector nozzle are arranged, while between the overpressure side of the injector nozzle and the warm water pressure flusher there is provided a control and relief conduit with a time delaying control valve interposed therein.

United States Patent 1 1 Mones et al.

1 1 FLUSHING SYSTEM FOR SANITARY FLUSHING DEVICES [75] Inventors: WalterMones, Haan; llarri Mones,

Gruiten, both of Germany [73] Assignee: Zimmer & Kellerman, Dusseldorf.

Germany [22] Filed: Dec. 21,1972

[21] Appl. No.: 317,355

[30] Foreign Application Priority Data Dec. 22. 1971 Germany 2163783[52] U.S. Cl. 4/1; 21/78; 134/43 [51] Int. Cl. A47k 17/00; B08b 3/04[58] Field of Search 4/1, 6, 7,10,112. 113, 4/224, 225, 233, 249, DIG.3; 134/143, 166 R, 170, 171; 21/78 [56] References Cited UNITED STATESPATENTS 1.892291 12/1932 Talus 134/143 2,761,149 9/1956 Kay i 4/1122.826.208 3/1958 Boffa 134/143 3,166,767 l/1965 .IeweII et a1. 4/103.629.872 12/1971 Parkison .i 4/1 3.645.283 2/1972 Cassells .i 134/143 1July 15, 1975 3.646.617 3/1972 Heald 4/1 3,720,961 3/1973 Garvey 4/1FOREIGN PATENTS OR APPLICATIONS 1.17131 1 1969 United Kingdom 4/1 OTHERPUBLICATIONS American Bedpan and Urinal Washing and SterilizingEquipment, Copyright 1936, Catalog Section H Amer. Sterilizer Co.

Primary Examiner-John W. Huckert Assistant Examiner-Stuart S. LevyAttorney, Agent, or Firm-Walter Becker [57] ABSTRACT A flushing systemfor sanitary flushing devices, especially for flushing and disinfectingbed pans, urine bottles and the like, with pressure flushers for coldand warm water, in which two pressure flushers for cold and warm waterrespectively are connected to a common flushing conduit in which a pipeinterruptor and an injector nozzle are arranged, while between theoverpressure side of the injector nozzle and the warm water pressureflusher there is provided a control and relief conduit with a timedelaying control valve interposed therein.

13 Claims, 3 Drawing Figures FLUSHING SYSTEM FOR SANITARY FLUSHINGDEVICES The present invention relates to a flushing system for sanitaryflushing devices, especially for flushing and disinfecting bed pans,urine bottles and the like with pressure flushers for cold and warmwater.

The heretofore known flushing systems for sanitary flushing devices areprovided with pressure flushers arranged between the pressure conduitsfor cold and warm water and the flushing conduits. These pressureflushers must be provided with a socalled pipe interrupter so that incase of a stoppage or clogging up, flushing water contaminated withfaeces or virus cannot flow back into the pressure conduits. The pipeinterrupters practically form an integral component of the heretoforeknown pressure flushers so that with the heretofore known flushingsystems it is not possible to connect the flushing conduits for cold andwarm water on the flushing side with each other because when actuating apressure flusher, due to the clog-up at the flushing nozzles, water fromthe pipe interrupter would flow out at the other pressure flusher.Moreover, with the heretofore known flushing systems, the differentpressure flushers for cold and warm water are manually actuated oneafter the other so that first only cold water will be injected andimmediately thereafter or at a spaced interval thereto only warm waterwill be injected into the flushing device by different flushing nozzles. Such an arrangement has inherent thereto the drawback that forinstance urine bottles of glass would break at a shock-like change-overfrom the cold water flushing to the warm water flushing. A furtherdrawback of the heretofore known flushing systems consists in that theflushing time for cold and warm water cannot always be preciselymaintained, and the warm water flushing may already be actuated beforesufficient pre-flushing with cold water has been effected. This resultsin the drawback that the faeces which, during the pre-flushing with coldwater had not been removed and when post-flushing with from warm to hotwater will be burned into the bed pan, will after completion of theflushing operation have to be removed mechanically.

It is, therefore, an object of the present invention to provide aflushing system for sanitary flushing devices, which will make itpossible while employing heretofore known pressure flushers, to connectthe flushing conduits for cold and warm water and an injection conduitfor wash-active substances and disinfectants at the flushing side sothat the flushing periods for cold and warm water may overlap and thusthrough the same flushing nozzles in the flushing device first coldwater and then mixed water and subsequently warm water, and in the endphase of the flushing operation a washactive substance and adisinfectant may be passed through with the flushing water.

It is another object of this invention to provide a flushing system asset forth in the preceding paragraph, which will be so designed that atthe start only the pressure flusher for the cold water will be actuatedand subsequently the flushing action will take place automatically inconformity with a fixed time plan.

It is still another object of this invention to provide a flushingsystem as set forth above which will overcome the drawbacks of theheretofore known devices of the general type involved.

These and other objects and advantages of the invention will appear moreclearly from the following specification in connection with theaccompanying drawings, in which;

FIG. 1 diagrammatically illustrates a flushing system without admixtureof a washing substance, water softener or disinfectant.

FIG. 2 diagrammatically illustrates a flushing system with the admixtureof a washing substance or water softener and disinfectant from a centralsupply station.

FIG. 3 shows a flushing system with the admixture of a washing substanceor water softener and a disinfectant from a supply tank.

Starting with a flushing system for sanitary flushing devices withpressure flushers for cold and warm water, the flushing system accordingto the present invention is characterized in that the two pressureflushers for cold and warm water are connected to a common flushingconduit in which a pipe interrupter and an injector nozzle are arranged,and is furthermore characterized in that between the high pressure sideof the injector nozzle and the warm water pressure flusher there isprovided a control and relief conduit with a time delaying control valveinterposed therein.

According to a practical embodiment of the present invention, the timedelaying control valve may be formed by a displaceable valve spool orcontrol piston adapted to be displaced against a pressure spring, apreceding and subsequently arranged two-way spindle valve, a by-passconduit interconnecting said valve, an air reservoir and an inletthrottle or choke determining the time delay. Furthermore, it has provenadvantageous to arrange a check valve between the control conduit andthe preceding two-way spindle valve, said check valve being arranged inthe by-pass conduit for the air reservoir. The check valve is intendedat the end of the throttle flushing operation to permit a fast escape ofthe water accumulated in the control valve and the air reservoir. Thecontrol piston is moved only when in the air reservoir a pressure hasbuilt up which corresponds to the resistance of the pressure springpreloading the control piston, The pre-filling of the air reservoir hasthe advantage that further control valves will be unnecessary. Therelief conduit of the warm waterpressure flusher is connected throughthe by-pass con duit to the control conduit at a certain time delay onlyafter the cold water-pressure flusher has been turned on so that thewarm water-pressure flusher will be placed into action at approximatelythe same time delay. In this way, the pressure flushers can be socontrolled that the flushing periods for cold and warm water willoverlap each other and thereby flushing water will at a mixingtemperature be pressed into the nozzles of the flushing devices. Inorder to make sure that with a possible backup in the flushing conduitno flushing water contaminated by faeces or virus will flow back intothe pressure conduits for cold and warm water, the pipe interrupterknown per se is in conformity with the invention interposed in thecommon flushing conduit for cold and warm water. The two pressureflushers for cold and warm water themselves do not have a pipeinterrupter.

According to a further development of the invention, for purposes ofadmixing wash-active substances and disinfectants from a supply line fedfrom a central station, there is provided between the under-pressureside of the injector nozzle and the supply line a time delayingadmixture valve with a two-way valve and an injection conduit leading tothe under-pressure side injector nozzle. The admixture valve expedientlyhas a displaceable valve spool or control piston displaceable againstthe thrust of a pressure spring, and furthermore has an inlet throttledetermining the time delay, as well as a by-pass line with a checkvalve, said by-pass line being provided between the control conduit andthe control piston. The time delay between the movement of the controlpiston in the admixture valve and the actuation of the coldwater-pressure flusher and the control pulse emanating therefrom in thecontrol conduit is so set that the admixture of the wash-activesubstance and of the disinfectant is effected only during the last fewseconds of the running period of the warm water-pressure flusher.

In order to make sure that the withdrawal of the wash-active substancesand of the disinfectant may be effected also from a pressureless storagetank, the admixture valve has in conformity with the inventionassociated therewith a pump which is arranged in parallel with regard tosaid admixture valve. According to a preferred embodiment of theinvention, this pump has a differential piston which is displaceableagainst a pressure spring and the low pressure side of which is adaptedto be connected with the control conduit which is connectable to theover-pressure side of the injector nozzle, whereas the high pressureside of said differential piston is connectable through the two-wayspindle valve of the admixture valve to the supply tank and to theinjection conduit. in this way, the washactive substance and thedisinfectant controlled by the admixture valve is at the end of theflushing program injected into the injection conduit, and aftercompletion of the flushing program, a new wash-active substance anddisinfectant is by the differential piston of the pump drawn in from thesupply tank. In order to make sure that the wash-active substance willnot be able during the injection stroke of the pump to flow back intothe supply tank, a check valve is provided at the end of the supplyconduit.

According to a further development of the invention, the coldwater-pressure flusher may likewise be independent of a manualactuation. To this end, a turningon valve precedes the coldwater-pressure flusher. More specifically, between the coldwater-pressure flusher and the under-pressure side of the injectornozzle, there is provided a relief conduit in which the twowayturning-on valve may be arranged.

The flushing system according to the present invention may also be usedto bring about an automatic locking or blocking of the flushing deviceduring the period during which the flushing cycle is in operation. Tothis end, the flushing device has a displaceable blocking piston whichis movable against the thrust of a pressure spring and which through apressure conduit communicates with the overpressure side of the injectornozzle. As soon as the flushing cycle starts, in this way the door ofthe flushing device is automatically locked and is unlocked only aftercompletion of the flushing cycle.

Referring now to the drawings in detail, cold water with a pressure offrom 2 to atmospheres above atmospheric pressure is conveyed by apressure conduit 1 to a pressure flusher 2 whereas warm water at apressure of from 2 to 10 atmospheres above atmospheric pressure isconveyed by a pressure conduit 3 to a pressure flusher 4. The twopressure flushers 2, 4 are as far as their structure is concerned knownin principle and comprise a housing 5, a piston 8 displaceable in acylinder 6 against a pressure spring 7, and a valve cover 9 at the lowerend of the piston 8. In the piston 8 there is provided a compensatingpassage 10 with narrow cross section. The function of the two pressureflushers 2, 4 is extremely simple. As soon as the cylinder 6 isrelieved, cold or warm water can flow. The piston 8 will then be liftedfrom below and will against the thrust of spring 7 be moved into thecylinder 6; at the same time, the valve cover 9 opens an outlet pipe 11at the lower end of the piston 8. As soon as the relief of cylinder 6has been interrupted, the pressure spring 7 again moves the piston 8downwardly. The speed and thereby the time delay at which the piston 8is by pressure spring 7 moved downwardly is determined by the crosssection of the compensating passage 10. During the downward movement ofthe piston 8, an under-pressure builds up in the cylinder 6 whichunder-pressure is compensated for by incoming water. Only when the valvecover 9 again rests on the outlet pipe 11, the through flow of the coldand warm water is again interrupted. In the illustrated embodiments, thecross sections of the compensating passages 10 are so designed that eachpressure flusher 2, 4 will after release have a running period ofapproximately 10 seconds.

From the two pressure flushers 2, 4, the cold or warm water flowsthrough flushing conduits 12, 13 into a common flushing conduit 14 whichthrough a pipe interrupter 15 and an injector nozzle 16 leads to aflushing device with three flushing nozzles 18 for a bed pan 19. Theflushing water contaminated by faeces flows out of the flushing device17 through an outlet pipe 20.

The pipe interrupter 15 which is built into the common flushing conduit14 has the purpose during a backup caused for instance by clogging ofthe outlet pipe 20, to prevent the flushing water contaminated withfaeces from flowing back into the two pressure flushers 2, 4 and therebyinto the pressure conduits l, 3. The function of the pipe interrupter 15is extremely simple. In a housing 21 the cover of which is provided withslots 22 there is arranged an elastic sleeve 23 of synthetic material orrubber which during the inflow of cold or warm water functionally movesin front of the slots 22. However, as soon as a backup forms, the sleeve23 again contracts and thus frees the slots 22 so that backup andpossibly contaminated flushing water can escape.

From the lower pressure side of the injector nozzle 16 a relief conduit24 in which a two-way turning-on valve 25 is arranged leads to thecylinder 6 of the cold water-pressure flusher 2. As soon as a key 26 isdepressed and thereby the two-way turning-off valve 25 is moved from theillustrated interrupted position a to the open position b, the coldwater which is under the conduit pressure of from 2 to 10 atmospheresabove atmospheric pressure, can, from the cylinder 6 of the pressureflusher 2, flow through the relief conduit 24 into the injector nozzle16 and thereby also through the flushing nozzles 18 into the flushingdevice 17. There upon, for approximately a period of 10 seconds, coldwater flows through the pressure flusher 2, the flushing conduits l2 and14, and the injector 16 to the flushing nozzles 18.

During the running period of the cold water-pressure flusher 2, acontrol valve 28 for the warm waterpressure flusher 4 is actuated bymeans of a control conduit 27 which originates in the overpressure sideof the injection nozzle 16. The control valve 28 has the function of atime delaying relay and comprises a cylinder 29 with a control piston 31which is displaceable against a pressure spring 30, a preceding two-wayspindle valve 32, a subsequent two-way spindle valve 33, a by-passconduit 34 interconnecting said two valves, an air reservoir 35, and aninlet throttle 36 determining the time delay.

The control valve 28 operates in the following manner:

As soon as the cold water-pressure flusher 2 has been actuated, water atthe normal flushing pressure flows from the overpressure side of theinjector nozzle 16 through the control conduit 27, the inlet throttle36, the cylinder 29 past the piston 31 through the two-way spindle valve32 occupying the illustrated position a, the by-pass conduit 34 and thetwo-way spindle valve 33 occupying the illustrated position a into theair reservoir 35. In order to make sure that the water which flowsthrough the control conduit 27 will not by-pass the inlet throttle 36and flow into the by-pass conduit 34, the two-way spindle valve 32 ispreceded by a check valve 37. The control piston 31 will initially notmove but only when a pressure equalization with regard to the pressurespring 30 acting upon the control piston 31 has occurred in the airreservoir 35. From this point on, the control piston 31 is displaced inthe direction toward the two-way spindle valve 33. As soon as thecontrol piston 31 is lifted off from a spindle 38 of the two-way spindlevalve 32, the spindle valve 32 jumps into the position b so that thethroughflow into the by-pass line 34 is blocked. With the illustratedembodiment, the control piston 31 wiill after approximately a runningperiod of 7 seconds of the cold waterpressure flusher 2 engage a spindle39 of the two-way spindle valve 33. As a result thereof, the two-wayspindle valve 33 jumps from the illustrated position a into the positionb so that warm water standing at the normal pressure of from 2-10atmospheres above atmospheric pressure can through a relief conduit 40of the warm water-pressure flusher 4 connected to the warmwater-pressure flusher 4 pass into the air reservoir 35. At thisinstant, warm water from the pressure conduit 3 can through the warmwater pressure flusher 4, flushing conduit 13 and 14, injection nozzle16 and flushing nozzles 18, flow into the flushing device 17. The twowayspindle valve 33 will keep the relief conduit 40 in open condition. Fromthe cylinder 6 of the pressure flusher 4 and the compensating passage 10water will flow out until in the reservoir 35 a pressure equalizationwith the feeding pressure of the pressure conduit 3 has taken place.Since with this pressure equalization no relief water can any longerescape from the pressure flusher 4, the latter starts its closingoperation as has been described with the cold water-pressure flusher 2.The control valve 28 will undergo no change until the pressure flushercloses. Only after the pressure flusher 4 has closed, the flushingconduit 14 and the injector nozzle 16 and thereby the cylinder 29 in thecontrol valve 28 become pressureless. Under the effect of the pressurespring 30, the control piston 31 is lifted off from the spindle 39. Thetwo-way spindle valve 33 then shifts over to the position a. The reliefconduit 40 of the pressure flusher 4 is now blocked or shut off withregard to the two-way spindle valve 33. At the same time the passagefrom the air reservoir 35 to the by-pass conduit 34 and thereby to thetwo-way spindle valve 32 is opened which latter occupies its position b.

The control piston 31 from now on quickly moves in the direction towardthe two-way spindle valve 32 while the water in the cylinder 29 will beable to flow into the outflow pipe 20 through the two-way spindle valve32 which is in the position b, the check valve 37 with large crosssection, the control conduit 27, the injector nozzle 16 and the flushnozzles 18. During the further course of the cycle, the control piston32 again shifts the two-way spindle valve 32 to is position a so thatthe water which, in the air container 35, is still under air pressurecan through the spindle valve 32 and the check valve 37 flow off intothe flushing device 17. The control valve 28 will then again be in itsstarting position.

The running periods of the two pressure flushers 2, 4 for cold and warmwater respectively overlap each other for approximately 3 seconds sothat during this period, flushing water will at a mixing temperature beinjected through the flushing nozzles 18 into the flushing device 17.When the cold water-pressure flusher 2 has been turned off, the warmwater-pressure flusher 4 will still continue running for approximately 7seconds. Due to the shift-over from the cold water flushing to warmwater flushing with a gradual increase in temperature, the sanitarydevices are considerably better flushed than has been possible withheretofore known flushing systems. Moreover, the sanitary devices as faras they are made of glass are saved and can no longer break in view of asudden temperature change.

A distributor 41 is interposed in the relief conduit 24 of the coldwater-pressure flusher 2 which leads from the under-pressure side of theinjector nozzle 16 to the two-way tuming-on valve 25 and into controlconduit 27 which leads from the under-pressure side of the injectornozzle 16 to the control valve 28. In this distributor 41, there isbranched off from the control conduit 27 a pressure conduit 42 whichleads to a blocking piston 43 in the flushing device 17. By means of theblocking piston 43 which is displaceable against the thrust of apressure spring 44, a door 45 of the flushing device 17 is blocked fromthe start of the flushing cycle to the completion thereof.

FIG. 2 shows an embodiment of a flushing system according to theinvention in which at the end of the running period of the warmwater-pressure flusher 4, a washing-active substance and/or adisinfectant is, from a supply conduit 46, injected into the flushingconduit 14. To this end, an admixing valve 48 is inserted or interposedin the supply conduit 46 and a washing-active substance conduit 47leading to the under-pressure side of the injector nozzle 16. Thisadmixing valve 48 is actuated through a control conduit 49 communicatingwith the over-pressure side of the injector nozzle 16. The admixingvalve 48 comprises a control piston 51 which is arranged in a cylinder50 and which is adapted to be displaced against the thrust of a pressurespring 52. The admixing valve 48 furthermore comprises a two-way spindlevalve 53, an inlet throttle 54, and an outlet conduit 55 with interposedcheck valve 56.

The inlet throttle 54 of the admixing valve 48 is so dimensioned thatthe running period of the control piston 51 after the coldwater-pressure flusher 2 has been turned on amounts to approximately 50seconds. Subsequently, the control piston 51 hits a spindle 57 of thetwo-way spindle valve 53 and shifts the latter from its illustrateduninterrupted position a into the throughflow position b for thewashing-active substance (WAS). At this instant, the WAS substance can,from the supply conduit 46 through the two-way spindle valve 53 and theWAS conduit 47 at the underpressure side of the injector nozzle 16, beinjected into the flushing conduit 14 while the quantity can becontrolled by means of an injection throttle in the admixture valve 48.As soon as the control pressure in the control conduit 49 decreasesafter the warm water-pressure flusher 4 has been turned off, thepressure spring 52 moves the control piston 51 back to its startingposition. The twoway control valve 53 jumps back onto its uninterruptedposition a, and the water which has entered the cylinder 50 will,through the outlet conduit 55 and the check valve 56, be pushed backinto the control conduit 49. Thereupon, the admixture valve 48 hasregained its starting position.

Inasmuch as the connection between the supply conduit 46 and the WASconduit 47 is established only toward the end of the running period ofthe warm waterpressure flusher 4, approximately 2 seconds before thewarm water-pressure flusher is turned off, the injection of thewashing-active substance and/or of the disinfectant is effected alsoonly during these last 2 seconds of the entire flushing cycle.

FIG. 3 illustrates a further modification of the flushing systemaccording to the invention, according to which the washing-activesubstance and/or the disinfectant is not added from a central supplystation into the supply conduit 46 under pressure but is pumped off froma supply tank 58. To this end, a pump 59 is shifted into communicationwith the admixing valve 48. The pump 59 comprises a differential piston61 which is arranged in a step-shaped cylinder 60 and which is adaptedto be displaced against the thrust of a pressure spring 62. in thisstarting position, the differential piston 61 has drawn wash-activesubstance from the supply tank 58 through the supply conduit 46 and thetwoway spindle valve 53 in the admixing valve 48. As soon as the controlpiston 51 in the admixing valve 48 has shifted the two-way spindle valve53 from the illustrated intake position a to the injection position b,pressure water can from the control conduit 49 flow through a pumpconduit 63 into the cylinder 60 and can displace the differential piston61. The drawn-in wash-active substance and/or the disinfectant isthrough an injection conduit and the two-way spindle valve 53 injectedinto the WAS conduit 47. At the end of the supply conduit 46, a checkvalve is arranged in order that the washing-active substance during theinjection stroke of the pump 59 cannot flow back into the supply tank58. The function of the admixing valve 48 will substantially remainunchanged.

As will be evident from the above, the flushing system according to thepresent invention has the outstanding advantage that by means of one andthe same flushing nozzles in the flushing device, dependent on the waterpressure, in conformity with a fixed determinable time program, firstcold water and then mixing water with increasing temperature andsubsequently only warm water is injected. A further advantage of theinvention consists in that the actuation of the warm water-pressureflusher is no longer effected manually at any at random time intervalafter the cold water pressure flusher has been turned off, but insteadis effected automatically in conformity with the running period of thecold water-pressure flushing in conformity with the fixed definite timeprogram. From this fact, there result the further advantages of a bettercleaning of the sanitary devices and the avoidance of breakage as far asthe devices consist of glass. Still another important advantage of theinvention consists in the reduction of the elements to be used becauseaccording to the invention only one set of flushing nozzles is requiredin the flushing device.

It is, of course, to be understood that the present invention is, by nomeans, limited to the particular arrangement shown in the drawings butalso comprises any modifications within the scope of the appendedclaims.

What we claim is:

l. A flushing system for sanitary flushing devices, especially forflushing and disinfecting bed pans and urine bottles, which includes incombination: a cold water pressure flusher having an inlet and an outletfor respectively receiving and discharging cold water, a warm waterpressure flusher having an inlet and an outlet for respectivelyreceiving and discharging warm water, flushing conduit means common tosaid cold water pressure flusher and said warm water pressure flusherand connected to the respective outlets thereof, pipe interrupter meansand injector nozzle means inter posed in said conduit means, saidinjector nozzle means having an overpressure side and a low pressureside and being located behind said interrrupter means when looking inthe direction of flow of the water from said pressure flushers throughsaid common conduit means, flushing nozzle means connected to saidinjector nozzle means for receiving flushing fluid therefrom anddispensing same, cold water relief conduit means inter posed between thecold water pressure flusher and the low pressure side of the injectornozzle, time delaying control valve means, warm water relief conduitmeans interposed between the warm water pressure flusher and the timedelaying control valve means, and control conduit means interposedbetween the time delaying control valve means, and control conduit meansinterposed between the time delaying control valve and the over pressureside of the injector nozzle.

2. A flushing system in combination according to claim 1, in which saidtime delaying control valve means includes: a spring loaded reciprocablecontrol piston, two two-way spindle valves respectively preceding andfollowing said control piston, by-pass conduit means adapted tointerconnect said spindle valves, an air reservoir connectable to saidby-pass conduit means, and inlet throttle means associated with saidtime delaying control valve means for determining the time delay of thelatter.

3. A flushing system in combination according to claim 2, in whichincludes a check valve means interposed between said control conduitmeans on one hand and that two-way spindle valve which precedes saidcontrol piston.

4. A flushing system in combination according to claim 2, in which thattwo-way spindle valve which follows said control piston is operableselectively to effect communication between said air reservoir and saidbypass conduit means and is also operable to effect communicationbetween said air reservoir and said warm water relief conduit means.

5. A flushing system in combination according to claim 1, which includessupply conduit means for supplying an additive to the flushing fluid, atime delaying admixing valve arranged between the overpressure side ofthe injector nozzle means and said supply conduit means, a two-wayspindle valve associated with said admixing valve and additive-conveyingconduit means communicating with said admixing valve and with theunder-pressure side of said injector nozzle means.

6. A flushing system in combination according to claim 5, in which saidadmixing valve includes a control piston and time delaying inletthrottle means, pressure spring means associated with said controlpiston, said control piston being displaceable against the thrust ofsaid pressure spring means.

7. A flushing system in combination according to claim 6, which includesby-pass conduit means connected to the overpressure side of saidinjector nozzle means and said control piston of said admixing valve,and check valve means associated with said last mentioned by-passconduit means.

8. A flushing system in combination according to claim 5, which includesa storage tank associated with said supply conduit means and alsoincludes pump means arranged in parallel to said admixing valve.

9. A flushing system in combination according to claim 8, in which saidpump means includes a differential piston having a low pressure side aswell as a high pressure side and also includes pressure spring means,said differential piston being displaceable against the thrust of saidpressure spring means, the low pressure side of said differential pistonbeing connected to the overpressure side of said injector nozzle meansand the high pressure side of said differential piston being connectedto the two-way spindle valve associated with said admixing valve to saidstorage tank.

10. A flushing system in combination according to claim 5, in which saidtime delaying control value means includes means for effecting a timedelay be tween the actuation of said cold water pressure flusher and theactuation of said admixing valve, to such an extent that the injectionof the additive by said admixing valve amounts to approximatelyseven-eighths of the total running period of the two pressure flushers.

11. A flushing system in combination according to claim 1, in which saidcold water relief conduit means includes a two-way turn-on valve.

12. A flushing system in combination according to claim I, whichincludes housing means for housing said flushing nozzle means, ablocking piston associated with said housing means, pressure springmeans associated with said blocking piston, said blocking piston beingdisplaceable against the thrust of said pressure spring means, andpressure conduit means adapted to establish communication between saidblocking piston and the overpressure side of said injector nozzle means.

13. A flushing system in combination to claim I, includes means forestablishing a time delay between the actuation of said cold waterflusher and said warm water flusher to such an extent that said timedelay amounts to approximately two-thirds of the running period of saidcold water pressure flusher.

1. A flushing system for sanitary flushing devices, especially forflushing and disinfecting bed pans and urine bottles, which includes incombination: a cold water pressure flusher having an inlet and an outletfor respectively receiving and discharging cold water, a warm waterpressure flusher having an inlet and an outlet for respectivelyreceiving and discharging warm water, flushing conduit means common tosaid cold water pressure flusher and said warm water pressure flusherand connected to the respective outlets thereof, pipe interrupter meansand injector nozzle means interposed in said conduit means, saidinjector nozzle means having an overpressure side and a low pressureside and being located behind said interrrupter means when looking inthe direction of flow of the water from said pressure flushers throughsaid common conduit means, flushing nozzle means connected to saidinjector nozzle means for receiving flushing fluid therefrom anddispensing same, cold water relief conduit means interposed between thecold water pressure flusher and the low pressure side of the injectornozzle, time delaying coNtrol valve means, warm water relief conduitmeans interposed between the warm water pressure flusher and the timedelaying control valve means, and control conduit means interposedbetween the time delaying control valve means, and control conduit meansinterposed between the time delaying control valve and the over pressureside of the injector nozzle.
 2. A flushing system in combinationaccording to claim 1, in which said time delaying control valve meansincludes: a spring loaded reciprocable control piston, two two-wayspindle valves respectively preceding and following said control piston,by-pass conduit means adapted to interconnect said spindle valves, anair reservoir connectable to said by-pass conduit means, and inletthrottle means associated with said time delaying control valve meansfor determining the time delay of the latter.
 3. A flushing system incombination according to claim 2, in which includes a check valve meansinterposed between said control conduit means on one hand and thattwo-way spindle valve which precedes said control piston.
 4. A flushingsystem in combination according to claim 2, in which that two-wayspindle valve which follows said control piston is operable selectivelyto effect communication between said air reservoir and said by-passconduit means and is also operable to effect communication between saidair reservoir and said warm water relief conduit means.
 5. A flushingsystem in combination according to claim 1, which includes supplyconduit means for supplying an additive to the flushing fluid, a timedelaying admixing valve arranged between the overpressure side of theinjector nozzle means and said supply conduit means, a two-way spindlevalve associated with said admixing valve and additive-conveying conduitmeans communicating with said admixing valve and with the under-pressureside of said injector nozzle means.
 6. A flushing system in combinationaccording to claim 5, in which said admixing valve includes a controlpiston and time delaying inlet throttle means, pressure spring meansassociated with said control piston, said control piston beingdisplaceable against the thrust of said pressure spring means.
 7. Aflushing system in combination according to claim 6, which includesby-pass conduit means connected to the overpressure side of saidinjector nozzle means and said control piston of said admixing valve,and check valve means associated with said last mentioned by-passconduit means.
 8. A flushing system in combination according to claim 5,which includes a storage tank associated with said supply conduit meansand also includes pump means arranged in parallel to said admixingvalve.
 9. A flushing system in combination according to claim 8, inwhich said pump means includes a differential piston having a lowpressure side as well as a high pressure side and also includes pressurespring means, said differential piston being displaceable against thethrust of said pressure spring means, the low pressure side of saiddifferential piston being connected to the overpressure side of saidinjector nozzle means and the high pressure side of said differentialpiston being connected to the two-way spindle valve associated with saidadmixing valve to said storage tank.
 10. A flushing system incombination according to claim 5, in which said time delaying controlvalue means includes means for effecting a time delay between theactuation of said cold water pressure flusher and the actuation of saidadmixing valve, to such an extent that the injection of the additive bysaid admixing valve amounts to approximately seven-eighths of the totalrunning period of the two pressure flushers.
 11. A flushing system incombination according to claim 1, in which said cold water reliefconduit means includes a two-way turn-on valve.
 12. A flushing system incombination according to claim 1, which includes housing means forhousing said flushing nozzle means, a blocking piston associated withsaid housing mEans, pressure spring means associated with said blockingpiston, said blocking piston being displaceable against the thrust ofsaid pressure spring means, and pressure conduit means adapted toestablish communication between said blocking piston and theoverpressure side of said injector nozzle means.
 13. A flushing systemin combination to claim 1, includes means for establishing a time delaybetween the actuation of said cold water flusher and said warm waterflusher to such an extent that said time delay amounts to approximatelytwo-thirds of the running period of said cold water pressure flusher.